CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Inlet turbulent boundary condition: external flows (http://www.cfd-online.com/Forums/fluent/50496-inlet-turbulent-boundary-condition-external-flows.html)

ROOZBEH February 6, 2009 12:03

Inlet turbulent boundary condition: external flows
 
Dear FLUENT user;

I want to simulate an external turbulent flow. To set the turbulence boundary conditions, there are some formulations in the software documentations, but unfortunately they are just for internal flows (duct flow).

How can I calculate the in-flow K and Epsilon for an external flow, for example the flow around a flat plate.

best regards, Roozbeh

Alagesanj February 7, 2009 21:49

Re: Inlet turbulent boundary condition: external f
 
Hi Roozbeh,

"For external flows the value of turbulent intensity at the freestream can be as low as 0.05% depending on the flow characteristics. You may have a good estimate of the turbulence intensity at the freestream boundary from experimentally measured data". The quote is taken from this link. http://support.esi-cfd.com/esi-users/turb_parameters/ You can follow this link and read through it. This document is for CFD ACE+ but generally applicable to all codes.

Cheers,


ROOZBEH February 8, 2009 08:02

Re: Inlet turbulent boundary condition: external f
 
Hi;

Thank you so much. That was very interesting and useful.

Roozbeh

TKP August 28, 2015 15:34

Turbulent intensity and viscosity ratio for flow over turbine
 
I am unable to find way to give Turbulent intensity and viscosity ratio for flow over turbine (external flow). Kindly help


All times are GMT -4. The time now is 01:28.